Most poisonous marine animals in Brazil

Brazil is a country of great animal and plant diversity, and certainly has places of great exuberance and natural beauty. Some beaches and reefs of the Brazilian coast are certainly among the most beautiful in the world, however some of these places may also hide some of the most poisonous marine animals in Brazil , and despite its beauty, you certainly will not want to come across one of these.

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Stay tuned here on YourCatCareguide for these curiosities of the animal kingdom.

It may also interest you: most poisonous insects in Brazil

Most dangerous marine animals in the world

The most dangerous marine animals are not only found in Brazil. See here in this other article that YourCatCareguide has prepared for you to be inside the 5 most dangerous marine animals in the world .

Among the most dangerous marine animals in the world we have:

Tiger shark

The white shark is the most feared shark in the marine world because of its size, but believe it or not, it has a temperament as docile as a whale, and attacks only if provoked. It is the tiger shark that deserves prominence in dealing with the most dangerous marine animals in the world, since it is a species of sharks considered aggressive. An adult can reach 8 meters in length and their preferred food are seals, dolphins, fish, squid, and can feed even small sharks.

Stone fish

It is considered the most dangerous marine animal in the world as the most poisonous fish in the world. His venom can cause paralysis, and it’s dangerous to be a master of disguise to inattentive swimmers. He is not an aggressive animal, since he prefers to keep his disguise by feeding on fish.

Marine snake

It is also not an aggressive animal, but in case the person does not take care their poison can also cause paralysis seconds after the bite. They feed on eels, clams and shrimps.


Saltwater crocodiles are among the most dangerous marine animals in the world, due to their aggressive temperament in times of breeding. They are known for their specific attack known as the “death roll” where they grab the prey with their mouth, rolling over it in the water to break the victim’s bones, and then dragging it to the bottom. They can attack buffaloes, monkeys and even sharks.

Venomous and venomous marine animals

Not only in Brazil, but in the world, it is rare for a person to die from contact with a marine or venomous animal. However, as these animals are being studied for an antidote, they are considered to be medically important animals , since some have poison so deadly that they can kill a person or leave important sequelae if the person survives the poison.

Among venomous and venomous marine animals that can be found in Brazil, we have several such as:


They are simple animals usually found in coral reefs near the ground.


They belong to the group of Cnidarians, are animals capable of injecting venom, and can cause anaphylactic shock and death if the person is not rescued in time. They are scattered around the world, and several species can be found in Brazil, especially in summer, which is the breeding season for these animals.


Molluscs are species of marine animals that live in shells and there are only 2 species capable of killing a human being, the Conus geographus and the Conus textile ( in the image below ). Both species inhabit the Pacific and Indian Oceans. The other species of the genus Conus are predators, and although they have poison that is used to capture their prey, they do not have venom, that is, enough venom to kill a human being and can be found on the northern coast of Brazil.

Some fish can also be considered venomous, like the Catfish and the Arraias. The Rays have a stinger and some species may have up to 4 stingers that produce an effect venom neurotoxic and proteolytic, ie, a poison with proteolytic action is one that has potecial to necrotic tissue of the body, which can cause the amputation of limbs because it is not reversible. Among the species in Brazilian waters are the stingray, stingray, stingray and stingray. The venomous catfish of the Brazilian waters have stinging stingrays, but live in lakes and rivers.

There are many other poisonous animals in the world , not just marine animals. Read our full article on this subject.

Poisonous aquatic animals


The platypus is one of the few marine mammals that have venom . It has spurs on its hind legs, and even though it is not lethal to humans, it can cause very strong pain. Platypus are found in Australia and Tasmania, and they only produce this venom at breeding season, which leads experts to believe it is to protect the territory of other males. Experts analyzed the venom produced by the platypus and discovered toxins similar to the poison produced by some venomous snakes and spiders. Although not a poison capable of killing a human being, the pain can be so jarring that it can cause hallucinations. Read our full article on venom of the platypus .


Also known as balloon fish or sea toad, this small fish has the ability to inflate your body like a balloon when you feel threatened by a predator, some species have thorns to hinder predation, however, all known species of pufferfish have a gland capable of producing a tetradoxin, a poison that can be a thousand times more deadly than cyanide. It is a fish very appreciated in gastronomy, so it is linked to the deaths of humans.

Most poisonous marine animals in the world

Among the most poisonous marine animals in the world we have:

Blue Ring Octopus

It is not found in Brazil, coming from the Australian coast. Its venom causes paralysis, which can lead to motor and respiratory arrest, and kill an adult in 15 minutes, although its small size, which can reach up to 20 centimeters in length, is proof that size is not a document.


Originating in the Indo-Pacific region, which includes the Indian and Pacific Oceans, this species of fish lives on coral reefs. Its poison does not kill a person, but can produce intense pain, followed by edema, vomiting, nausea, muscle weakness and headaches. It is a species that became popular as a pet and kept in captivity in aquariums because of its beauty, but we must not forget that it is a carnivorous fish, feeding on other smaller fish than it.


This living water is the cousin of the Sea Wasp, which you must have heard, as the most poisonous animal on the planet. Irukandji comes from Australia, which means it is not found in Brazil, and is extremely small, about the size of a nail, and because it is transparent it is difficult to detect. There is no antidote to your poison, which can cause kidney failure and consequent death.

Portuguese caravel

It belongs to the group of Cnidarians and is similar to jellyfish, except that the Portuguese Caravela floats on the surface of the waters and does not have the capacity to move alone, depending on the current and sea winds. It has tentacles that can reach up to 30 meters in length. Although the Portuguese Caravela looks like an animal, it is actually a living being made up of a colony of interrelated cells, and this organism has no brain. The Portuguese caravel releases a toxin of both local and systemic action, and depending on the area of ​​the burn the person needs rescue, since the systemic effect of the toxin can cause a cardiac arrhythmia, pulmonary edema and consequent death. They can be found all over the world.

Dangerous Animals of Brazil

If you like to be informed and know the dangerous species that inhabit Brazil and the rest of the world, you will surely be interested in our articles of YourCatCareguide:

If you want to see more of the similar products to the most venomous marine animals of Brazil , we recommend you to enter our section of Curiosities of the animal world .

    Emily Harris

    Hi Guys, Girls, and Cats:-pI am Emily Harris, and you can see in above pic. She loves me I swear. I saved her from a dumpster a few weeks back.

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